Jackson doesn't have a stable API for building modules. You have to get elbow deep in their internals, which is already scary enough given that it's an old and

Jackson doesn't have a stable API for building modules. You have to get elbow deep in their internals, which is already scary enough given that it's an old and highly performant library, but the bad part is that there's no formal commitment to maintaining compatibility. You just have to hope that the modules you use are popular enough that they will test them and make an effort not to break them. I've had an application break on a patch version bump of Jackson.